Gun magazine

Abstract

A gun magazine includes an outer shell, an inner shell mounted in the outer shell and including a top opening, a track extended from the top opening, a guide block supported on a spring member in a rear end of the track and movable in and out of the top opening, a bottom cover affixed to the inner shell and the outer shell at a bottom side, and an adjustment member including a lever inserted through an elongated slot in the bottom block, a pivot holder located at a top end of the lever and pivotally connected to the inner shell and a guide rod extended from the top end of the lever and terminating in a retaining tip that is movable in and out of the track to stop or not to stop the guide block subject to operation of the lever between two positions, thereby adjusting the bullet storage capacity of the track.

What is claimed is: 
     
       1. A gun magazine comprising:
 an outer shell made in the form of a vertically extending double open ended shell; 
 an inner shell mounted inside said outer shell, said inner shell comprising a track defined therein, an opening located in a top side thereof in communication with a front end of said track, a locating rod located in an opposing rear end of said track, a spring member mounted in said track, said spring member comprising a first end facing toward said opening and an opposing second end mounted on said locating rod, and a guide block supported on said first end of said spring member and movable in and out of said opening; 
 a bottom cover affixed to a bottom side of said inner shell and a bottom side of said outer shell, said bottom cover comprising an elongated slot disposed in communication with said track; and 
 an adjustment member inserted through said elongated slot of said bottom cover, said adjustment member comprising a retaining tip suspending inside said inner shell, said adjustment member being operable to move said retaining tip between an outer position where said retaining tip is shifted into said track to stop said guide block in a mid part of said track and an inner position where said retaining tip is shifted out of said track for allowing movement of said guide block to the rear end of said track to compress said spring member toward; 
 wherein: 
 said adjustment member further comprises a lever inserted through said elongated slot of said bottom cover, said lever comprising a top end disposed inside said outer shell and an opposing bottom end disposed outside said outer shell and terminating in an operating tip, a guide rod formed integral with the top end of said lever and terminating in said retaining tip, and a pivot holder formed integral with the top end of said lever and pivotally connected to said inner shell, said operating tip of said adjustment member being operable to move said lever between a first position in one end of said elongated slot and a second position in an opposite end of said elongated slot, said retaining tip being shifted to said outer position when said operating tip is operated to move said lever to said first position, said retaining tip being shifted to said inner position when said operating tip is operated to move said lever to said second position. 
 
     
     
       2. The gun magazine as claimed in  claim 1 , wherein said guide block comprises a protruding portion located at a rear end thereof adapted for stopping against said retaining tip when said retaining tip is shifted into said track to stop against said guide block. 
     
     
       3. The gun magazine as claimed in  claim 2 , wherein said inner shell comprises a through hole; said pivot holder is pivotally connected to said inner shell to keep said adjustment member in between said inner shell and said outer shell; said guide rod comprises an angled rod body extended from the top end of said retaining tip and inserted through said through hole of said inner shell into the inside of said inner shell and terminating in said retaining tip.